QUADRATICS – Difference of 2 Squares

 

 

 

 

This important result needs to be remembered in two ways:

 

          Result 1:      

 

          Result 2:      

 

Result 2 is most commonly used when factorising:

 

          Eg1:   

 

These kind of questions are easily spotted as they:

 

·         only have 2 terms

·         always have subtract sign

·         always have square numbers

·         usually have even powers

 

Always first re-write the question as a difference of two squared terms before factorising:

 

          Eg2:   

 

 

          Eg3    

 

 

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